Thousands of celebrities and politicians have had their names permanently banned from the new .xxx adult pornography internet domain.
More than 4,000 celebrities, from Angelina Jolie to Donald Trump, have had their .xxx web address blocked by ICM Registry, the firm managing the new adult entertainment domain.
The company has reserved 15,000 "dot triple-X" domain names on the request of international governments and child protection agencies.
Companies can register to avoid being associated with what has been dubbed the "online red light district" from Wednesday until October 28. They will have to pay $200 to $300 to buy .xxx addresses containing their trademarks before they go on general sale.
Around 1,500 .xxx domains have already been allocated to 35 porn companies.